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Convertible Preferred Stock - Additional Information (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) $ / shares shares | Feb. 28, 2019 USD ($) $ / shares shares | Sep. 30, 2020 $ / shares shares | Sep. 30, 2019 USD ($) | Dec. 31, 2019 $ / shares shares
Class Of Stock [Line Items] |  |  |  |  |
Convertible preferred stock, issued | shares |  |  | 118,766,273 |  | 118,766,273
Convertible preferred stock, par value |  |  | $ 0.001 |  | $ 0.001
Proceeds from issuance of series H preferred stock | $ |  |  |  | $ 10,000 |
Conversion of stocks, description |  |  | The holders of Series A-1, Series A-2, and Series A-3 (collectively, “Series A”); Series B and Series B-1 (collectively, “Combined Series B”); Series C; Series D; Series E; Series F, Series G, and Series H are entitled to convert their shares into common stock at the option of the holder, at any time, into fully paid and non‑assessable shares of common stock. The number of shares of common stock to which a holder of the Series A, Combined Series B, Series C, Series D, Series E, Series F, Series G, and Series H (collectively, “Series Preferred”) can convert is obtained by multiplying the conversion rate that is in effect by the number of shares of Series Preferred being converted. The conversion rate is determined by dividing the original issue price by the applicable conversion price (initially the original issue price for all classes of Series Preferred except Series B‑1, for which the conversion price is initially $2.75). As a result of the reverse stock split effected in October 2020, the conversion rate for the Series Preferred is 0.1684664 per share. Following the closing of the IPO in October 2020, each share of Series Preferred automatically converted into shares of common stock (based on the then‑effective Series Preferred conversion price). |  |
Preferred stock, voting rights |  |  | one vote for each share of common stock on an as‑if‑converted basis. |  |
Preferred stock, redemption terms |  |  | Series Preferred stockholders are subject to automatic redemption in the consolidation or merger of the Company or sale of all or substantially all of the Company's assets in which the stockholders of the Company immediately prior to the transaction hold less than 50% of the outstanding securities of the surviving entity. |  |
Maximum |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Percentage of outstanding share holders required for automatic stock conversion |  |  | 50.00% |  |
Reverse Stock Split |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Preferred stock conversion rate |  |  | 0.1684664 |  |
Series H Convertible Preferred Stock |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Convertible preferred stock, issued | shares | 8,695,621 | 8,695,621 | 23,923,188 |  |
Convertible preferred stock, par value | $ 1.15 | $ 1.15 | $ 1.15 |  |
Proceeds from issuance of series H preferred stock | $ | $ 10,000 | $ 10,000 |  |  |
Preferred stock dividends rate |  |  | 8.00% |  |
Series B-1 Convertible Preferred Stock |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Convertible preferred stock, issued | shares |  |  | 2,998,852 |  |
Convertible preferred stock, par value |  |  | $ 3.20 |  |
Preferred stock conversion price |  |  | $ 2.75 |  |
Series G Convertible Preferred Stock |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Convertible preferred stock, issued | shares |  |  | 46,146,517 |  |
Convertible preferred stock, par value |  |  | $ 0.75 |  |
Preferred stock dividends rate |  |  | 8.00% |  |
Series F Convertible Preferred Stock |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Convertible preferred stock, issued | shares |  |  | 19,468,203 |  |
Convertible preferred stock, par value |  |  | $ 1.50 |  |
Preferred stock dividends rate |  |  | 8.00% |  |
Series E Convertible Preferred Stock |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Convertible preferred stock, issued | shares |  |  | 7,639,556 |  |
Convertible preferred stock, par value |  |  | $ 5.00 |  |
Preferred stock dividends rate |  |  | 8.00% |  |
Series D Convertible Preferred Stock |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Convertible preferred stock, issued | shares |  |  | 10,874,876 |  |
Convertible preferred stock, par value |  |  | $ 4.00 |  |
Preferred stock dividends rate |  |  | 8.00% |  |
Series C Convertible Preferred Stock |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Convertible preferred stock, issued | shares |  |  | 2,356,596 |  |
Convertible preferred stock, par value |  |  | $ 3.00 |  |
Preferred stock dividends rate |  |  | 8.00% |  |
Combined Series B |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Preferred stock dividends rate |  |  | 8.00% |  |
Series A |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Preferred stock dividends rate |  |  | 8.00% |  |

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- Definition Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (27) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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